1120 error, don't get it

Hi!

I’m trying to “link” a button(fac_btn) on a movieclip(tint_mc).
Only thing is that my button(fac_btn) is inside another movieclip-layer(fac_mc).
I know it’s a bad habit, but there’s no other way…
So Flash can’t find tint_mc, because he is on the stage.

How can I fix this?
This is my code


fac_btn.addEventListener(MouseEvent.CLICK, clickFunction);

function clickFunction(evt:MouseEvent):void {
tint_mc.gotoAndPlay("on");
}